how to fix P0171 code in Honda Accord 10th Generation (2018-2022)?

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a level surface and the engine is off.
• Disconnect the negative terminal of the battery to ensure safety.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamps, silicone sealant.
• Check all vacuum hoses and connections for cracks or disconnections.
• If leaks are found, replace damaged hoses or use silicone sealant on connections as needed.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, screwdriver.
• Disconnect the MAF sensor electrical connector.
• Remove the MAF sensor from the air intake duct.
• Clean the sensor using MAF sensor cleaner and allow it to dry completely.
• Reinstall the sensor and reconnect the electrical connector.

4. Test and Replace Fuel Pump or Filter (if necessary)

• Tools Required: Fuel pressure gauge, wrench set.
• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition to the ON position (without starting the engine) and check the pressure.
• If the pressure is below specifications (consult the manufacturer’s manual), replace the fuel pump or filter as needed.

5. Inspect and Clean Fuel Injectors

• Tools Required: Fuel injector cleaning kit, safety glasses.
• Use a fuel injector cleaning kit to clean the injectors according to the manufacturer's instructions.
• If cleaning does not resolve the issue, replace faulty injectors.

6. Check and Replace Oxygen Sensors (if necessary)

• Tools Required: O2 sensor socket, ratchet.
• Inspect the upstream oxygen sensor for proper operation.
• If found faulty, remove the sensor using the O2 sensor socket and replace it with a new one.